CVE-2026-41126 | BDVDB-2026-328192 Detail

bigbluebuttonbigbluebutton

Description#

BigBlueButton is an open-source virtual classroom. Versions prior to 3.0.24 have an Open Redirect through bigbluebutton/api/join via get-parameter "logoutURL." Version 3.0.24 has adjusted the handling of requests with incorrect checksum so that the default logoutURL is used. No known workarounds are available.

Impact#

Per CVSS v3.1: confidentiality impact low, integrity impact none, availability impact none. Attack vector: network.

Weaknesses#

CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

References#

https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-cvwj-4pcp-f3g8

Exploit#

No public exploit known

History#

Version 12026-04-21Record published in the CVE List.
Version 22026-04-22Most recent update recorded in the CVE List.

Published

Published: 2026-04-21
Last modified: 2026-04-22

Vendor information

Vendor: bigbluebutton
Product: bigbluebutton

All bigbluebutton vulnerabilities

Score

4.3 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 14.1.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 3.0.24
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

4.3 Medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	Required
Scope	Unchanged
Confidentiality	Low
Integrity	None
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).